System.UnauthorizedAccessException when trying to start a Maui WinUI app with Mobile.BuildTools.Configuration

[BurkusCat]

Description

Android + iOS Maui Mobile.BuildTools.Configuration seems to work fine! Trying to initialise the configuration manager/register the dependency causes an exception for WinUI.

Full error message:
System.UnauthorizedAccessException: 'Access to the path 'C:\WINDOWS\system32\Configuration' is denied.'

Reproduction Steps

Steps to reproduce the behavior:

1. Add Mobile.BuildTools and Mobile.BuildTools.Configuration to a Maui project
2. Add your app.config files as raw MauiAssets
3. Register the ConfigurationManager instance with DI
4. In the platform specific Window's App.xaml.cs, call ConfigurationManager.Init(true);

Expected Behavior

The WinUI app launches and the groundwork for using Mobile.BuildTools is setup

Actual Behavior

The app crashes on startup with an exception:

Removing the config code and only registering the ConfigurationManager.Current dependency:

When I try debugging inside the library, it appears to be using the CommonConfigManager which I think is the .NET Standard code path (intended for console apps/servers?).

One theory I have is that the library doesn't know about WinUI TargetFramework (https://github.com/dansiegel/Mobile.BuildTools/blob/master/src/Mobile.BuildTools.Configuration/Mobile.BuildTools.Configuration.csproj#L42) and is therefore not invoking any of the UWP code (would the UWP code work for WinUI?).

Environment

• OS: Windows 11
• IDE: VS2022
• BuildTools Version: 2.0.245
• IDE Version: 17.4.0
• Build Target Framework: net6.0-windows10.0.19041.0

Reproduction App

https://github.com/BurkusCat/MbtConfigurationWinUIException

[dansiegel]

Well for starters WinUI isn't a supported or tested target. If you'd like to contribute to the project I'd be happy to have it support WinUI. But I can't promise timelines if you're waiting on me.